What does the moon icon in the upper right corner of the hammer phone mean?

The moon icon should be a reminder of tamper-proof mode.

It doesn't sound or vibrate, and the phone and text messages won't wake up the phone when the screen is locked. Suitable for meetings or driving.

Disturbance-free mode refers to a mode that avoids irrelevant information from affecting the ongoing process. If you don't call, text messages don't bother, and games don't bother.

In order to prevent users from being disturbed by security software when playing games, many security software have introduced their own non-interference mode. In this mode, the security software will stop popping up warning dialog boxes, automatic upgrade and scheduled scanning, and other operations that affect users' enjoyment of the game.